<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <script>
      const name = "jack"; //
      const uname = name; //2
      const info = { age: 20, name: "jack", w: 100, h: 200 }; // 100
      const user = info; //
      const user2 = info; //3
    </script>
  </body>
</html>
